/Engine/Source/Runtime/Engine/Classes/Components/MeshComponent.h
Material parameter setting and caching Set all occurrences of Scalar Material Parameters with ParameterName in the set of materials of the SkeletalMesh to ParameterValue
void SetScalarParameterValueOnMaterials ( const [FName](API\Runtime\Core\UObject\FName) ParameterName, const float ParameterValue )